storage: test that object names are not unicode-normalized
storage: test that object names are not unicode-normalized

Similar to https://github.com/GoogleCloudPlatform/google-cloud-dotnet/pull/933 .

Change-Id: I9258658dcf5303a6e52ce36750b7a5d1a413a9f7
Reviewed-on: https://code-review.googlesource.com/11671
Reviewed-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Jonathan Amsterdam <e3d3698b2ccd5955e4adf250d0785062d0f9018b@google.com>

googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go